As popular as the designs for X-carriages with 40mm fans between the rods are, they cause a loss of x-axis travel of at least 10mm per fan. With 20mm fans like I use, this means there'll be a total of a 40mm reduction. The goal for this design is to maximize the amount of X-axis travel while still having 2 fans.

This is an updated, completely redrawn version of my previous X-Carriage.

Designed for use with 16mm diameter bushings. If you have linear bearings with the same OD, you could use those too. Uses zipties to secure the bushings to the carriage, since I noticed that regular designs for bushing carriages crack around the bushings.

Updated 25/6/2013; Download this newer file.
Added 2Fan 16mm Bushing X-Carriage 002 (repaired).stl which changes are;
Increased the area where the zip ties would contact the bushings to hold them down.
Lengthened the studs on the clamps slightly.
Added a pair of optional clamps that would make the tensioner work.
Changed the design of the fan holders back to one without the clips since they break off easily.
Added a small chamfer to the fan holder to guide airflow slightly.

Changes;

• Added a slightly larger gap around the extruder so that it's easier to fit wires through.
• Parts that were thin and broke off easily made thicker and more rigid.
• Belt clamping area made longer, so that you have more room to make adjustments while keeping the belt straight.
• Increased gap for zipties slightly so that there's more contact between the zipties and the bushing.
• Redesigned fan holders, it should be easier to screw together.
• More pretty beveled edges.